'57 Johnson Javelin - How to Install Water Tube in Exhaust Housing?

[Shakedownscott]

This motor followed me home a while back. I have been using it as a parts motor for other projects, as it was incomplete when I got it.

I have been slowly collecting parts for her with the thought of some day getting her back together. One puzzle I have is the water tube. When I removed the lower unit the water tube pulled out from the top of the exhaust housing. I don't think it was really hooked up to anything, it came out with no resistance.

Here is a picture of the water tube and water pump housing.



Here is the end of the tube that goes into the exhaust housing.



When I look down at where the tube should go, it looks like there is a copper tube in there and a brass fitting all swedged in.





Here is a photo of the water tube held next to the exhaust housing. The tube has pretty much the same diameter as the brass fitting.



I have tried to tap out the brass fitting from the bottom and also tried to rotate it. Other than drilling it out, I am not sure what else to do. Has anyone had these apart before? Any advise would be appreciated.

 

[hardwater fisherman]

If anything like later models it pushes on from the bottom. I think there is a bushing that also goes with it.

 

[lindy46]

Yup, bushing is missing. Part #0302894

 

[F_R]

Close but no cigar. Somebody has "fixed" your broken water tube. The water tube is held in by a compression sleeve and screw (nut). OMC called the sleeve a "gland", but it is actually what a plumber would call a compression sleeve. The whole mess is badly corroded away on yours. You probably will have to do some drilling and re-tapping. Good luck.
BTW, the "gland" is part number 7X170, replaced by 306323, and the compression screw is 302894. There was a special tool for installing the screw. You will also need a new water tube, part number 304680.

 

[hardwater fisherman]

Was it built this way? Or would the factory water tube be like on my 70s 40hp where it just pushes in from the bottom?

 

[hardwater fisherman]

No Title

I see the difference now . Mine looks like this one in the photo.

 

[Shakedownscott]

Thanks everyone for the help. I ordered a new water tube and compression screw. Could not find the "gland" yet but will keep looking for it. Hopefully its a common sized ferrule and is available locally.

Now comes the fun of trying to get the rest of it apart.

 

[F_R]

I could be mistaken, but I suspect it is a standard size compression sleeve available everywhere.

 

[Shakedownscott]

Thanks to all of your help I was able to get this puzzle figured out. I was able to machine out the existing pieces and re-tap this to fit the new pieces. I don't think that this housing was ever drilled and tapped originally. When I drilled it out to the tap drill size there was no evidence of any threads in the bore. There was a piece of copper tube that was help in place by a steel sleeve that was pressed into the exhaust housing bore.







Thanks everyone for the help.

 

[Crosbyman]

shouldn't that water pipe be flared a bit or have that brass collar installed before screwing-in the new threaded part to compress and hold the water tube in place ?

 

[heypawpaw]

There doesn't appear to be enough threads on new piece inserted in exhaust housing to attach compression nut and secure ferrule in place.

 

[Crosbyman]

silly but.... could you solder the water pipe and threaded part together and screw it in a few turn to line up with the pump output' with the pump end in place it will never unscrew itself from the engine side

just a suggestion if you are at a dead end on this (add teflon tape before screwing it in )


​or.... can you get a somewhat longer piece of similar threaded pipe to which you can join the "shortened" water tube .... hey whatever works !

 

[Shakedownscott]

shouldn't that water pipe be flared a bit or have that brass collar installed before screwing-in the new threaded part to compress and hold the water tube in place ?

The water tube goes in the exhaust housing from the bottom, through the threaded hole. Then the brass collar goes over the tube and the threaded piece goes on. The threaded piece compresses the brass collar which then squeezes the tube to seal.

In the bottom picture I just have the threaded piece screwed in to see how it fit.

 

[Shakedownscott]

There doesn't appear to be enough threads on new piece inserted in exhaust housing to attach compression nut and secure ferrule in place.

If I went any deeper with my threads it would have wiped out the shoulder left at the bottom of the hole. Then there would be nothing to hold the ferrule from falling right through the hole. I agree that I would have liked a few more threads in there. I was able to tighten everything up by hand and the ferrule snugs down on the tube and holds it. I have to get the lower unit installed so that I can set the height of the tube correctly before tightening this ay further. Hoping for the best when I tighten it down.

 

[Shakedownscott]

silly but.... could you solder the water pipe and threaded part together and screw it in a few turn to line up with the pump output' with the pump end in place it will never unscrew itself from the engine side

just a suggestion if you are at a dead end on this (add teflon tape before screwing it in )


​or.... can you get a somewhat longer piece of similar threaded pipe to which you can join the "shortened" water tube .... hey whatever works !

Those are both great suggestions to try. Will keep them I mind if this first approach does not work.

I have thought of adding some JB weld to the pieces to help holed them in place and seal everything up. Probably not needed but wouldn't want things to loosen up over time. Not sure how tight I can get this before the threads strip out or push the ferrule out the bottom of the hole.